Using Output State Control (OSC) and Monitoring PIDs
To confirm that the OSC value was sent by the Scan Tool and the powertrain control module (PCM) has accepted the OSC substitution, a corresponding PID for each OSC parameter must be monitored. After sending the OSC value the corresponding PID value should equal the OSC value. Additional PIDs should be monitored to help the technician adequately diagnose the transmission. The following is a list of PIDs to monitor while using OSC.
OSC PARAMETER
| OSC Parameter | Corresponding PID | Additional PIDs |
|---|---|---|
| SSA | SSA | SS1F |
| SSB | SSB | SS2F |
| SSC | SSC | SS3F |
| CCS | CCS | CCSF |
| EPC | EPC | - |
| TCC | TCC | TCCF, TCCCMD, TCCACT |
| GEAR | GEAR | TP, RPM, TSS, OSS, TR, TFT, TRANRAT and VS |
PID DESCRIPTION CHART
| PID Name | PID description |
|---|---|
| CCS | Coast clutch solenoid commanded state (not actual state) - ON or OFF |
| CSSF | Coast clutch solenoid circuit fault - YES or NO |
| EPC | Electronic pressure control commanded pressure (not actual) - PSI |
| GEAR | GEAR commanded state (not actual) 1st, 2nd, 3rd or 4th |
| OSS | Output shaft speed sensor input - RPM |
| RPM | Engine speed sensor input - RPM |
| SSA | Shift solenoid No. 1 commanded state (not actual) - ON or OFF |
| SSB | Shift solenoid No. 2 commanded state (not actual) - ON or OFF |
| SSC | Shift solenoid No. 3 commanded state (not actual) - ON or OFF |
| SS1F | Shift solenoid No. 1 circuit fault - YES or NO |
| SS2F | Shift solenoid No. 2 circuit fault - YES or NO |
| SS3F | Shift solenoid No. 3 circuit fault - YES or NO |
| TCCACT | Torque converter clutch slippage (engine speed minus turbine speed) - RPM |
| TCCCMD | Torque converter clutch solenoid commanded state - duty cycle |
| TCCF | Torque converter clutch solenoid fault - YES or NO |
| TFT | Transmission fluid temperature - degrees F° or voltage |
| TP | Throttle position - voltage |
| TR | Transmission range sensor - PARK, NEUTRAL, OVERDRIVE |
| TRANRAT | Actual transmission gear ratio - unitless |
| TSS | Turbine shaft speed sensor input - RPM |
| VS | Vehicle speed sensor input - RPM |
To confirm that the OSC substitution occurred, SEND the OSC value and monitor the corresponding PID value. If no ERROR MESSAGE was received and the value of the corresponding PID is the same as the value sent from OSC, the OSC substitution was successful.